Preparation of (Z)-α-chloro-α,β-unsaturated ketones with total or high diastereoselectivity
摘要:
(Z)-alpha-Chloroenones are obtained by reaction of alpha-chloro-beta-hydroxyketones with acetic anhydride, pyridine and 4-dimethylaminopyridine with total or high diastereoselectivity and in high yield. (C) 2002 Elsevier Science Ltd. All rights reserved.
Preparation of (Z)-α-chloro-α,β-unsaturated ketones with total or high diastereoselectivity
作者:José M Concellón、Mónica Huerta
DOI:10.1016/s0040-4020(02)00935-3
日期:2002.9
(Z)-alpha-Chloroenones are obtained by reaction of alpha-chloro-beta-hydroxyketones with acetic anhydride, pyridine and 4-dimethylaminopyridine with total or high diastereoselectivity and in high yield. (C) 2002 Elsevier Science Ltd. All rights reserved.
An efficient synthesis of (E)-α,β-unsaturated ketones and esters with total stereoselectivity by using chromium dichloride
作者:José M. Concellón、Humberto Rodríguez-Solla、Carmen Méjica
DOI:10.1016/j.tet.2006.01.052
日期:2006.4
(E)-α,β-Unsaturatedketones 1 or esters 2 can be obtained with complete stereoselectivity by reaction of different 2-chloro-3-hydroxy ketones 3 or esters 4 and CrCl2. A comparative study of the results of synthesis of ketones 1 with CrCl2 or samarium is performed. A mechanism to explain both β-elimination reactions has been proposed.